Opening M Files

The M file type is primarily associated with MATLAB.

M	File extension: M
	File type:	source code file

What is an M file?

M files mostly belong to MATLAB. *.m files are mainly used for storing MATLAB code. They are plain text files that contain scripts, functions, or complete programs designed to run in the MATLAB environment.
In many cases, these files include function definitions or sequential command sets used to perform calculations or data analysis.
Usage details:

MATLAB Code File: A file that holds MATLAB commands and can include user-defined functions or scripts.

Function Files: Files that define MATLAB functions, which can be called by other programs or scripts.

Script Files: Files that contain a sequence of commands executed in order by MATLAB.

Occasionally, file scanning may reveal *.m files noted as part of an Android app cache. In these cases the extension is used to store temporary data rather than code.
FilExt.com note: You can open a MATLAB *.m file using the MATLAB application or any text editor that supports plain text. For further instructions on writing and viewing MATLAB function files, visit this MATLAB help page or see more details on the MathWorks website.

How to open an M file

You need a suitable software like MATLAB to open an M file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your M file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a M file directly in the browser:. Just drag the file onto this browser window and drop it.

Online M Text Viewer

Choose your .m file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert M files:

MATLAB
See the previous paragraphs to learn more about the main application. M files are often referred to as MATLAB developers because this type of file is primarily created or used by this software.
Amiga E (Source Module) by Wouter van Oortmerssen
Amiga E, or very often simply E, is a programming language created by Wouter van Oortmerssen on the Amiga. Although development ended in 1997, Amiga E still has a large following. Modules are linked with the compiled source code to form the final executable. Related links: Wikipedia Amiga E Page
Brief Macro Source
Cliq Accessories Datebook Modification File
Related links: Linux Suite (PDF File)
Desktop Color Separation Specification Magenta Layer
(usually an EPS file)
Limbo Interface Declaration
(Inferno OS)
Maple (Common Binary File) by Maplesoft, a Division of Waterloo Maple Inc.
Maple is a productivity tool for solving mathematical problems and creating interactive technical applications. The identifying characters used for this association are - Hex: 4D, ASCII: M.
Mathematica (Functions and Commands) by Wolfram Research, Inc.
Mathematica is a complete environment for all technical computing tasks, whether simple calculations or large-scale computations, complex programming, visualizing or modeling data, or even presenting to collegues or clients. This file contains functions and commands.
MATLAB (Function or Script) by The MathWorks, Inc.
MATLAB is a high-level language and interactive environment that enables you to perform computationally intensive tasks faster than with traditional programming languages. (Note: As of 22 Apr 2006, infection code for a virus that infects these files was found in proof of concept.) The Mime types used with this association are: application/matlab, application/mfile. This file format is classified as Source Code.
Miranda language Script File
Objective-C Source
(.M for implementation file) Related links: Info Source
Winamp3
Also an Origin AdLib Music Format which can be played using Winamp and the AdPlug plug-in. This file format is classified as Audio. Related links: AdPlug

M file format:

A file format defines how the data in the file is structured. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. So you need a detailed analysis of a file to find out the format and the associated program. In the following you will find our evaluation of the M files:

The M extension is very commonly used. This M file itself is among the most popular common file types and covers different formats for different programs. However, the following two file formats are common:

35% of all M files have the same signature 00 03 00. These are binary files, so they do not contain words or text. M files can be up to 49 KB in size, but are often around 22 KB - 40 KB. The file type was developed only in the last few years. A common filename is cache_bd.m or cache_its.m. Files like these have the following tags: cache, android, pois, inaka, google, apps, labl and gallery.
15% of all M files start with the bytes 00 00 00, which are crucial for this file format. These files are binary files, so they do not contain text, but only cryptic characters. M files can be up to 40 KB in size, but are often around 22 KB - 27 KB. A common filename is cache_bd.m or cache_its.m. These files are often associated with messaging, samsung, whatsapp, photos, signin, accountservices, tracfone and preload.

The remaining 50% of all M files are files with no common format, often, for example, PC9801 rip, Source, ZIP and AGE. Often described as lowerjaw, mobileservice, mobile, ebce, ubercab, matlab, tooth, area or code. Just click the "Choose your .m file to analyze" button on this page to find out what your M file is.

Technical Data for M File Extension

File classification:

Developer

Related files:

mlx, mat, mex, c, h, cpp, asv, vts, slx, t, cache, mdl, zip, txt, p, k, uid, %24%24m, fig, v, pdf, jpg, nomedia, y, mph, e

Related links:

Wikipedia Amiga E Page

Mime type:

text/x-objcsrc, text/x-mumps, text/x-octave

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: ASFFile
EXEFile: %ProgramFiles%\Windows Media Player\wmplayer.exe /prefetch:7 /Open %L

ProgramID: mfile
EXEFile: %ProgramFiles%\MatLab7\bin\win32\meditor.exe %1

ProgramID: RealPlayer.RM.6
EXEFile: %ProgramFiles%\K-Lite Codec Pack\Media Player Classic\mplayerc.exe %1

ProgramID: RealPlayer.RM.6
EXEFile: %ProgramFiles%\Real\RealOne Player\RealPlay.exe %1

ProgramID: RealPlayer.RM.6
EXEFile: %ProgramFiles%\Real\RealPlayer\RealPlay.exe %1

ProgramID: RealPlayer.RM.6
EXEFile: %ProgramFiles%\Real\RealPlayer\RealPlay.exe /m application/vnd.rn-realmedia %1

ProgramID: Winamp.File
EXEFile: %ProgramFiles%\Winamp\winamp.exe %1

ProgramID: mfile
EXEFile: C:\MATLAB7\bin\win32\meditor.exe %1

ProgramID: mfile
EXEFile: m:\MATLAB6p5\bin\win32\meditor.exe %1

ProgramID: mfile
EXEFile: F:\MATLAB6p5\bin\win32\meditor.exe %1

ProgramID: Notepad++_file
EXEFile: %ProgramFiles%\Notepad++\notepad++.exe %1

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB6p5\bin\win32\meditor.exe %1

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB701\bin\win32\meditor.exe

ProgramID: jGRASPObjCFile
EXEFile: %ProgramFiles%\jGRASP\bin\jgrasp.exe

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB\bin\win32\meditor.exe

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB704\bin\win32\meditor.exe

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB\R2006a\bin\win32\meditor.exe

ProgramID: mfile
EXEFile: %ProgramFiles%\matlabR14\bin\win32\meditor.exe

ProgramID: mfile
EXEFile: %ProgramFiles%\MATLAB\R2006b\bin\win32\meditor.exe

Show all 19 listings To Top

an m source code file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with M files

Associate the M file extension with the correct application.
Update your software that should actually open source code files. Because only the current version supports the latest M file format. Search, therefore, e.g. on the manufacturer website after an available MATLAB update.
To make sure that your M file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .M file online - secure, fast, and no downloads needed.